What Kinds of Nootropics Are Out There?

The category is broad. A comprehensive peer-reviewed study breaks nootropics into four main groups:

Classical nootropic compounds, the original class of lab-developed molecules designed to improve how the brain forms and retrieves memories.
Substances that increase brain metabolism by improving blood flow and energy production in the brain.
Cholinergic agents that support acetylcholine, the neurotransmitter most closely tied to memory and learning.
Plant extracts and natural compounds with nootropic effects, such as Bacopa monnieri, Ginkgo biloba, L-theanine, and others.

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